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Artist's commentary
『Twin-chan』
This Week's Second Daughter✨ 『Twin-chan』
Imouto: "Please let go Onee-sama. I can't change my clothes this way."
Ane: "I won't."
Preliminary Announcement for Next Week... This time, it's these twins
Source: https://twitter.com/monpictura/status/979923189542174722
Imouto means "Younger Sister", Ane means "Elder Sister". I have left them as their Japanese pronunciations as they don't appear to have a name. "Futago" means "Twin/Twins".